The IAB announced this morning that online ad revenues were $7.3 billion in the US in Q1 2011. This is a 23 percent increase over the same period last year. In 2010 total online revenues were $26 billion according to the IAB.
For the full year 2010 (graph below) paid search constituted 46 percent of total online ad revenues. If that’s still the case it would mean that Q1 2011 search revenues are roughly $3.35 billion.
Assuming about 25 percent growth overall this year, 2011 online ad revenues could reach $31 or $32 billion. That would mean 2011 search revenues would be nearly $15 billion.